abstract
Surface-reflected seismic energy from underground explosions, in the form of a pP phase and a spall-closure (slapdown) phase, Ps, may contribute to the P wave and coda seen at teleseismic distances. In this report, delay times corresponding to pP − P and Ps − P are estimated from surface-zero accelerograms for a number of U.S. underground nuclear explosions and are presented for use by the seismological community. When compared with published estimates, these pP − P estimates are in reasonable agreement but the Ps − P estimates are at wide variance. No ready explanation is at hand for the disagreement.
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